/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.launcherplus;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.KeyEvent;
import android.view.View;
import android.widget.FrameLayout;

/**
 * A ViewGroup that coordinated dragging across its dscendants
 */
public class DragLayer extends FrameLayout {
    DragController mDragController;

    /**
     * Used to create a new DragLayer from XML.
     *
     * @param context The application's context.
     * @param attrs The attribtues set containing the Workspace's customization values.
     */
    public DragLayer(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setDragController(DragController controller) {
        mDragController = controller;
    }
    
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        return mDragController.dispatchKeyEvent(event) || super.dispatchKeyEvent(event);
    }
    
    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN && Launcher.mAppLaunchTimeLog) {
            Log.i(Launcher.TAG, "[AppLaunch] " + "Launcher TouchEvent Entry Pont: DragLayer.dispatchTouchEvent");
        }
    	int type = ev.getAction();
    	boolean result = super.dispatchTouchEvent(ev);    	
    	boolean isDraging = mDragController.isDraging();
    	
    	if (type == MotionEvent.ACTION_CANCEL || type == MotionEvent.ACTION_UP) {
    		if (isDraging) {
    			//  if after MotionEvent.ACTION_UP event , the state is still draging
    			//  we need to call onIntercepTouchEvent to clear the draging state
    			Log.w("LauncherPlus","(DragLayer)dispatchTouchEvent failed to process the event " ); 
    			onInterceptTouchEvent(ev);
			}
    	}

    	return result;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return mDragController.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return mDragController.onTouchEvent(ev);
    }

    @Override
    public boolean dispatchUnhandledMove(View focused, int direction) {
        return mDragController.dispatchUnhandledMove(focused, direction);
    }
}
